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the flight control panel (P5 forward overhead).
Yaw Damper Indicator
The yaw damper indicator is on the P2 panel.
YDS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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YDS - FLIGHT COMPARTMENT COMPONENT LOCATION
YDS - FLIGHT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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Stall Management Yaw Damper
SMYD 1 and 2 are on the E3-2 shelf in the electronic equipment
compartment.
YDS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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YDS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
YDS - ELECTRONIC EQUIPMENT COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Yaw Damper Components in Vertical Stabilizer
These yaw damper components are on the main rudder PCU in
the vertical stabilizer.
* Yaw damper solenoid valve
* Yaw damper electro-hydraulic servo valve (EHSV)
* Yaw damper actuator
* Linear variable differential transformer (LVDT).
The LVDT is not line replaceable.
Access to these yaw damper components is from an access
panel on the right side of the vertical stabilizer.
YDS - VERTICAL STABILIZER COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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22-23-00-005
YDS - VERTICAL STABILIZER COMPONENT LOCATION
YDS - VERTICAL STABILIZER COMPONENT LOCATION
EFFECTIVITY
SHZ ALL 22-23-00
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22-23-00-005
Power Interface
SMYD 1 gets 28v dc from electrical bus 1 and 28v ac from
transfer bus 1. 28v dc power goes from SMYD 1 to the yaw
damper engage switch.
The yaw damper indicator gets 115v ac from transfer bus 1.
The yaw damper LVDT gets 28v ac from the same circuit as
SMYD 1.
Digital Data
The SMYD 1 receives airplane gross weight data from the FMC.
The SMYD 1 receives these air data from the left ADIRU:
* Airspeed
* Impact pressure.
The SMYD 1 receives these inertial data from the left and right
ADIRUs:
* Lateral acceleration
* Roll angle
* Roll rate
* Yaw rate.
Analog Signals
SMYD 1 is enabled for primary yaw damping operation when
the FLT CONTROL B switch on the flight control panel is ON.
SMYD 1 calculates and sends yaw damper commands to the
yaw damper components on the main rudder PCU to move the
rudder. These are the solenoid valve, EHSV, and yaw damper
actuator. The LVDT on the main rudder PCU sends rudder
position feedback to SMYD 1 and to the yaw damper indicator to
show rudder movement.
The trailing edge flaps up limit switch sends flap position data to
SMYD 1. The SMYD uses this during yaw damping to limit
rudder movement when flaps are up.
The left AOA sensor sends airplane angle of airflow information
to SMYD 1.
The yaw damper disengage light receives power from the DC
power and dim control.
YDS - INTERFACES
EFFECTIVITY
SHZ ALL 22-23-00
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22-23-00-006
YDS - INTERFACES
YDS - INTERFACES
EFFECTIVITY
SHZ ALL 22-23-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-006
Purpose
The yaw damper solenoid valve on the main rudder PCU
pressurizes the yaw damper system. When you engage the yaw
damper system, the solenoid valve sends hydraulic fluid to the
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